Indicator for testing liquids with respect to viscosity.



H. MIKOREY. INDICATOR FOR TESTING LIQUIDS WITH RESPECT TO VISGOS APPLICATION FILED MAR. 16, 1906.

920,604, Patented May 4, 1909.

of viscosity and for the testing of liquids and the city of Schoneberg, near Berlin, Kingof a propeller screw operating within a 'quid conspicuous.

of a device which is represented by way of UNITED STATES PATENT onmon.

HANS MIKOREY, OF SGHONEBERG, GERMANY, ASSIGNOR TO THE FIRM OI W. GRAAFF 6: COMPAGNIE, GES. MIT BESOHR. HAFTUNG, OF BERLlNpGERMANY.

INDICATOR FOR TESTING LI Q UIDS WITH RESPECT TO VISCOSITY.

Specification of Letters Patent.

Application filed latch 16, 1906.

Patented May 4, 1909.

Serial No. 806,412.

T 0 all whom it'may concern:

Be it known that I, HANS MIK REY, a civil engineer, and a subject. of the German Emperor, residing at 13 Wartburgstrasse,-in

dom of Prussia and German Empire, have invented a certain new and useful Indicator for Testing Liquids with Respect to Viscosity, of which the following is a specification.

This invention has reference to a method and to a device for making determinations in particular of lubricating oils. In order to test lubricating materials, such as oils and the like, for viscosity and slippery condition, .the present invention makes use of the ower with a certain rate of driving power as a standard base for comparison and for the purpose of producing an indicating movement. The propeller screw is movably mounted beneath the. lev'elof the liquid and in such a manner, as to allow of its being screwed forward up to a certain limit and against the action of a given resistance or load, until the slip is compensated by the driving power of the propeller. From the rate of movement, which may be read off on a scale or indicating device, it, is possible to estimate'the degree of viscosity and slipperi-- ness of the liquid under consideration as compared with another li uid, even very delicate differences in qua ity being made The method may be carried out by the aid example.

In the drawing. a designates the receptacle or container for the liquid, which is filled up to a certain level w1th the liquid to be tested. Within this receptacle a propeller screw 1) operates, the shaft w of which is journaled in a movable frame d. The said frame, upon which the driving motor engine m is also mounted, can be swung around the pivot c and is provided with a pointer 2 moving upon a scale s and having the tendency to assume a certain initial position in consequence of the distribution of weight and of the mounting of the frame. The motor engine m is represented as a small compressed air turbine, while the compressed air for the operation of the turbine may be admitted by a movable flexible tube conduit n. Provision has to be made for a uniform and if possible controllable driving of the motor.

When the motor engine m is started and causes the propeller shaft to to rotate with a certain speed, the propeller screw 1) generates a driving ower, which tends to cause a swinging. 9 the frame d in the direction indicated by the arrow. According to the viscosity and to the degree of slippery condition of the liquid the condition 0 equilibrium will be obtained after a limit of movement corresponding to a smaller or larger arc of movement of the pointer, at which limit the slip resultin from the resistance of the counter weig t will balance the action of the driving ower of the propeller. The resistance is etermined by the one-sided action of the load upon the frame which is pivoted at is valued as an advantage, in particular in making comparative tests of samples of lubricating oils.

WhatI claim and desire to secure by Letters Patent of the United States is l. Indicator for testing liquids with respect to viscosity comprising a fulcr'umed lever, an indicator or hand forming one arm of said lever to act on a graduated scale, a scale concentric tothe fulcrum of the lever, a propeller screw having its shaft suitably journaled in the other arm of said lever, adapted to revolve in the liquid to be tested, and a motor of approximately constant driving power to turn the propeller in the liquid, substantially as described.

.2. Indicator for testing liquids with respect to viscosity comprising a double armed lever, an indicator or and forming one arm of said lever, adapted to act o'n-a graduated scale, a scale concentric to thefulcrum of the 'leveri a frame secured to-the other armof said ever, a shaft journaled in said frame, a

pro eller screw secured to one end of the my name this third day of March 1906, in the she t and adapted'to revolve in the liquid presence of two subscribing witnesses.

to be tested a motor of up roximately constant driving power secure to the other end HANS MIKOREY' 5 of said shaft to turn the propeller screw, sub- Witnesses:

stantially as described. HENRY HAsPER,

In witness whereof I have hereunto signed WOLDEMAR HAUPTQ 

